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Income Taxes
9 Months Ended
Sep. 30, 2013
Income Taxes [Abstract]  
Income Taxes
8.Income Taxes

The effective income tax rates for the quarters ended September 30, 2013 and 2012 were 29.5% and 28.9%, respectively. For the nine months ended September 30, 2013 and 2012, the effective income tax rates were 29.8% and 30.1%, respectively. The effective tax rates in both 2013 and 2012 were reduced by changes in estimates associated with the finalization of prior year foreign and domestic tax items. The 2013 rates in the quarter and nine-month periods include the impact of the restructuring costs.